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PORTABLE
FORCED
AIR HEATER
OWNER’S MANUAL
Models: B50H and REM50C
Heater Size: 50,000 Btu/Hr
IMPORTANT
Read and understand this manual before assembling, starting, or servicing
heater. Improper use of heater can cause serious injury. Keep this manual
for future reference.
®
ARL LOGO G 004
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SECTION PAGE CONTENTS Safety Information......................................................................... 2 Product Identification .................................................................... 4 Unpacking ..................................................................................... 4 Theory of Operation ...................................................................... 4 Fuels ..............................................................................................
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WARNINGS (Continued) SAFETY • Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never use INFORMATION gasoline, naphtha, paint thinners, alcohol, or other highly flammable fuels. Continued • Fueling a) Personnel involved with fueling shall be qualified and thoroughly familiar with the manufacturer’s instructions and applicable federal, state, and local regula- tions regarding the safe fueling of heating units. b) Only the type of fuel specified on the heater’s data plate shal
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Hot Air Outlet Handle PRODUCT Upper Shell IDENTIFICATION Fan Guard Lower Shell Air Filter End Cover Fuel Tank Fuel Cap Side Cover Ignition Control Assembly (assembly on inside of side cover) Power Cord Figure 1 - 50,000 Btu/Hr Model 1. Remove all packing items applied to heater for shipment. UNPACKING 2. Remove all items from carton. 3. Check items for shipping damage. If heater is damaged, promptly inform dealer where you bought heater. The Fuel System: The air pump forces air through the air
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FUELS WARNING Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never use gasoline, naphtha, paint thinners, alcohol, or other highly flammable fuels. Do not use heavy fuels such as No. 2 fuel oil or No. 2 Diesel. Using heavy fuels will result in: • clogged fuel filter and nozzle • the need of non-toxic anti-icer in fuel during very cold weather IMPORTANT: Use a KEROSENE ONLY storage container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water wil
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Note: If shipping, transport companies require fuel tanks to be empty. STORING, 1. Drain fuel tank. Drain fuel through fuel cap opening. Be sure all fuel is re- TRANSPORTING, moved. 2. If any debris is noted in old fuel, add 1 or 2 quarts of clean kerosene to tank, OR SHIPPING stir, and drain again. This will prevent excess debris from clogging filters during future use. 3. Replace fuel cap. Properly dispose of old and dirty fuel. Check with local automotive service stations that recycle oil. 4.
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TROUBLE- WARNING SHOOTING Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. FAULT CONDITION POSSIBLE CAUSE REMEDY Motor does not start No power to heater Check circuit breaker in five seconds after electrical panel. heater is plugged in. Bad electrical connection Check all electrical connec- between motor and ignition tions. See Wiring Diagram, control assembly or ignition page 11. assembly and power cord Binding pump rotor If fan does n
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SERVICE ! WARNING PROCEDURES Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur. Upper Upper Shell Removal Shell 1. Remove screws along each side of Fan heater using 5/16" nut-driver. These Guard screws attach upper and lower shells together. 2. Lift upper shell off. 3. Remove fan guard. Fan IMPORTANT: Remove fan from motor shaft before removing motor Figure 3 - Upper Shell Removal from heater. The weight of the motor resting on the fan co
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Pump Pressure Adjustment 1. Remove pressure gauge plug from filter end cover. 2. Install accessory pressure gauge (part number HA1180). Relief Pressure 3. Start heater (see Operation, page 5). Valve Gauge Allow motor to reach full speed. Plug 4. Using a flat blade screwdriver, set the pressure to 3.6 PSI. Turn relief valve to right to increase the pressure. Turn relief valve to left to decrease the pressure. 5. Remove pressure gauge. Replace pressure gauge plug in filter end Figure 6 - Pressure Ga
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Nozzle 1. Remove upper shell (see page 8). 2. Remove fan (see page 8). Combustion 3. Remove fuel and air line hoses from Chamber nozzle assembly. 4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove. 5. Place plastic hex-body into vise and lightly tighten. Burner Nozzle Nozzle Assembly Strap 6. Carefully remove nozzle from the Assembly nozzle adapter using 5/8" socket wrench. 7. Blow compressed air through face of nozzle. This will free any dirt in Fuel Line Hose nozzle area.
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Gap Adjusting Screw (Pump Rotor, continued) 10.Install blades, pump plate, air filters, and filter end cover. .003"/.004" Gap 11.Replace fan guard and upper shell. Measured With 12.Adjust pump pressure (see page 9). Feeler Gauge Note: If rotor is still binding, proceed as follows. Sandpaper Blade 13. Perform steps 1 through 6 (see page 10). Rotor 14.Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in Gap Adjusting Screw “figure 8” motion four times (see Fig- ure 14). Figure 1
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You may have further questions about operation or troubleshooting. If so, contact TECHNICAL DESA International’s Technical Service Dept. at 1-800-323-5190. SERVICE Note: Use only original replacement parts. This will protect your warranty cover- REPLACEMENT age for parts replaced under warranty. PARTS Parts Under Warranty Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Technical Service Dept. at 1-800-323-5190. When calling
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ACCESSORIES Purchase accessories and parts from your nearest dealer or AIR GAUGE KIT - HA1180 service center. If they can not Special tool to check pump supply these accessories or parts, pressure. either contact your nearest Parts Central or DESA International for referral information. Parts Centrals are listed in the Autho- rized Service Center booklet supplied with heater. DESA International THERMOSTAT P.O. Box 90004 KIT - HA1210 Bowling Green, KY Keeps your building at 42102-9004 the tempera
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ILLUSTRATED 4 1 PARTS BREAKDOWN 2 5 9-1 36 9-5 9-2 3 9 7 6 11 9-4 9-3 8 21 10 12 18 13 20 22 16 23 24 25 28 26 27 30 29 35 34 19 12-1 17 12-2 15 14 12-3 33 32 12-4 31 12-5 12-6 12-18 12-7 12-17 12-8 12-16 12-9 12-15 12-14 12-10 12-13 Motor and Pump Assembly 12-12 12-11 14 102553
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This list contains replaceable parts used in your heater. When ordering parts, PARTS LIST be sure to provide the correct model and serial numbers (from the model plate), Models B50H then the part number and description of the desired part. and REM50C KEY PART KEY PART NO. NUMBER DESCRIPTION QTY. NO. NUMBER DESCRIPTION QTY. 1 M51104-01 Handle 1 18 M50631 Rubber Bumper 2 2 098511-54 Upper Shell (B50H) 1 19 097461-03AA Side Cover 1 098511-67 Upper Shell (REM50C) 1 20 101205-01 Motor Bracket 1 3 M11
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WARRANTY AND REPAIR SERVICE WARRANTY SERVICE LIMITED WARRANTY Should your heater require service, return it to your nearest authorized service center. Proof of purchase must DESA International warrants this product and any be presented with the heater. The heater will be inspected. parts thereof, to be free from defects in materials and A defect may be caused by faulty materials or workman- workmanship for six (6) months from the date of first ship. If so, DESA International will repair or replac
